* {
  margin: 0;
  padding: 0; }

body {
  background: skyblue; }

.click_frequency {
  position: absolute;
  top: 20px;
  left: 35%; }

.time {
  position: absolute;
  top: 20px;
  left: 55%; }

.container {
  width: 500px;
  height: 500px;
  background-color: skyblue;
  margin: 50px auto;
  border: 1px solid pink; }
  .container .box {
    width: 100px;
    height: 100px;
    margin-left: 20px;
    margin-top: 20px;
    float: left;
    position: relative; }
    .container .box img {
      width: 100%;
      height: 100%; }
    .container .box .bg {
      position: absolute;
      top: 0;
      left: 0; }

.startBtn {
  position: absolute;
  top: 500px;
  left: 75%;
  display: none; }
